Thanks for your very thorough explanation of how the Swarm and Debra DBAs were designed to work.
I can personally attest to how the Debra DBA actually does produce extraordinarily bass results in my 23ft x 16ft living room for both music (often hi-rez 24bit/96khz WAV files as well as ripped copies of redbook CDs) and as part of a 5.1 surround system for HT. I assume the almost identical Swarm would perform equally well in my system and room.
The way this DBA system so seamlessly integrates with my older Magnepan 2.7QR main speakers is truly exceptional. I believe either the Debra or Swarm DBA would likely be a very good solution for extending and improving bass response and impact in any room and likely integrate very well with any brand or type of main speakers. But I agree the very fast and articulate bass produced by these DBAs are especially good for mating with Magnepans and any electrostatics. I also like the way they can effortlessly reproduce deep and powerful bass when the content calls for it.
I'd definitely suggest the OP, imdoc, would be well served by auditioning either the Debra or Swarm DBA with his very nice Magnepan 20s in his room before purchasing any other bass solution.
Thanks,
Tim